Binary blend of carbon dioxide and fluoro ethane as working fluid in transcritical heat pump systems
As an eco-friendly working fluid, carbon dioxide or R744 is expected to substitute for the existing working fluids used in heat pump systems. It is, however, challenged by the much higher heat rejection pressure in transcritical cycle compared with the traditional subcritical cycle using...
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VINCA Institute of Nuclear Sciences
2015-01-01
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doaj-1da5c4466aff401ca228428483c5048d2021-01-02T07:19:23ZengVINCA Institute of Nuclear SciencesThermal Science0354-98362334-71632015-01-011941317132110.2298/TSCI1504317Z0354-98361504317ZBinary blend of carbon dioxide and fluoro ethane as working fluid in transcritical heat pump systemsZhang Xian-Ping0Wang Fang1Fan Xiaowei2Xue Yong-Fei3Henan Institute of Engineering, School of Civil Engineering, Zhengzhou, Henan, ChinaZhongyuan University of Technology, School of Energy and Environment, Zhengzhou, Henan, ChinaZhongyuan University of Technology, School of Energy and Environment, Zhengzhou, Henan, ChinaHenan Institute of Engineering, School of Civil Engineering, Zhengzhou, Henan, ChinaAs an eco-friendly working fluid, carbon dioxide or R744 is expected to substitute for the existing working fluids used in heat pump systems. It is, however, challenged by the much higher heat rejection pressure in transcritical cycle compared with the traditional subcritical cycle using freons. There exists a worldwide tendency to utilize blend refrigerants as alternatives. Therefore, a new binary blend R744/R161 in this research is proposed in order to decrease the heat rejection pressure. Meanwhile, on mixing R744 with R161, the flammability and explosivity of R161 can be suppressed because of the extinguishing effect of R744. A transcritical thermodynamic model is developed, and then the system performances of heat pump using R744/R161 blend are investigated and compared with those of pure R744 system under the same operation conditions. The variations of heat rejection pressure, heating coefficient of performance, unit volumetric heating capacity, discharge temperature of compressor and the mass fraction of R744/R161 are researched. The results show that R744/R161 mixture can reduce the heat rejection pressure of transcritical heat pump system.http://www.doiserbia.nb.rs/img/doi/0354-9836/2015/0354-98361504317Z.pdfcarbon dioxideR161heat pumpblendtranscritical |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Zhang Xian-Ping Wang Fang Fan Xiaowei Xue Yong-Fei |
spellingShingle |
Zhang Xian-Ping Wang Fang Fan Xiaowei Xue Yong-Fei Binary blend of carbon dioxide and fluoro ethane as working fluid in transcritical heat pump systems Thermal Science carbon dioxide R161 heat pump blend transcritical |
author_facet |
Zhang Xian-Ping Wang Fang Fan Xiaowei Xue Yong-Fei |
author_sort |
Zhang Xian-Ping |
title |
Binary blend of carbon dioxide and fluoro ethane as working fluid in transcritical heat pump systems |
title_short |
Binary blend of carbon dioxide and fluoro ethane as working fluid in transcritical heat pump systems |
title_full |
Binary blend of carbon dioxide and fluoro ethane as working fluid in transcritical heat pump systems |
title_fullStr |
Binary blend of carbon dioxide and fluoro ethane as working fluid in transcritical heat pump systems |
title_full_unstemmed |
Binary blend of carbon dioxide and fluoro ethane as working fluid in transcritical heat pump systems |
title_sort |
binary blend of carbon dioxide and fluoro ethane as working fluid in transcritical heat pump systems |
publisher |
VINCA Institute of Nuclear Sciences |
series |
Thermal Science |
issn |
0354-9836 2334-7163 |
publishDate |
2015-01-01 |
description |
As an eco-friendly working fluid, carbon dioxide or R744 is expected to
substitute for the existing working fluids used in heat pump systems. It is,
however, challenged by the much higher heat rejection pressure in
transcritical cycle compared with the traditional subcritical cycle using
freons. There exists a worldwide tendency to utilize blend refrigerants as
alternatives. Therefore, a new binary blend R744/R161 in this research is
proposed in order to decrease the heat rejection pressure. Meanwhile, on
mixing R744 with R161, the flammability and explosivity of R161 can be
suppressed because of the extinguishing effect of R744. A transcritical
thermodynamic model is developed, and then the system performances of heat
pump using R744/R161 blend are investigated and compared with those of pure
R744 system under the same operation conditions. The variations of heat
rejection pressure, heating coefficient of performance, unit volumetric
heating capacity, discharge temperature of compressor and the mass fraction
of R744/R161 are researched. The results show that R744/R161 mixture can
reduce the heat rejection pressure of transcritical heat pump system. |
topic |
carbon dioxide R161 heat pump blend transcritical |
url |
http://www.doiserbia.nb.rs/img/doi/0354-9836/2015/0354-98361504317Z.pdf |
work_keys_str_mv |
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